Evaluating Java for Game Development

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In practice this means that one should not rely on static compilers for your specific product. If a static compiler can be used with success and it improves performance then this is fine, but one should not rely on it working or even improving performance over Hotspot virtual machines. Some people prefer static compilers for deployment reasons. The deployment of Java programs are discussed in more detail in chapter 8. 6 Dirty Java Often one has an application where certain parts of the program must run at a very high performance while it is less important with the rest.

Limited AWT support. No Swing support. In addition to JNI it has its own native interface called CNI which is faster than JNI. If one uses CNI then the code is locked to gcj. e. ) • NaturalBridge BulletTrain • Instantations JOVE • Wind River Systems Diab FastJ • Tower Technology TowerJ (does not support AWT or Swing) • Metroworks Codewarrior for Java Some Java development tools try to give the customer/user the impression that they contain a static native code compiler although they do not. This includes Webgain Visual Café (formerly Symantec Visual Café) and Microsoft J++.

This is not the case in Java. There are several reasons for this. The greatest problem is that objects in Java cannot be stored on the stack. This means that the Java programmer allocated objects on the heap in many cases when the C++ programmer does not: • Every time some temporary object is needed. C++ programmers can often just allocate them on the stack. • Every time a primitive data type needs to be passed by reference to a method. In Java primitive data types are passed by-value, so to pass it by-reference it must be encapsulated in an object that might be created for the purpose.

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